I would need to read something definitive on your a and b. As for c, I think the DH is moot because the NL eschews it. The playoffs are about money, nothing more, and hardly a refinement to the basic game. Heck, they were copies from the NFL, NBA, and NHL. Instant replay is a mixed blessing to me. Overall, it speeds up the game by preventing managers from racing onto the field every time they don't like a call. But instant replays also interrupt the flow of the game, and half the time they only confirm what the umpire called.
As for you later point about goggles to assist umpires, I'm not so sure, but will at least reserve judgment.